Geographia Polonica (1973) vol. 27

Isaak M. Maergoiz, Institute of Geography Academy of Sciences of the USSRVenyamin M. Gokhman, Institute of Geography Academy of Sciences of the USSRGeorgii M. Lappo, Institute of Geography Academy of Sciences of the USSRYurii L. Pivovarov, Institute of Geography, Academy of Sciences of the USRR, Moscow